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authorDaniel Bristot de Oliveira <bristot@kernel.org>2021-10-31 19:04:59 +0100
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-11-01 18:10:05 -0400
commit2bd1bdf01fb25906f18cd8ebfac81c2217d1478a (patch)
tree6f081cb298d7906fe2639fb42da70847d02165ba /kernel
parent15ca4bdb0327b35e09682a0f7975e21688f54306 (diff)
tracing/osnoise: Use start/stop_per_cpu_kthreads() on osnoise_cpus_write()
When writing a new CPU mask via osnoise/cpus, if the tracer is running, the workload is restarted to follow the new cpumask. The restart is currently done using osnoise_workload_start/stop(), which disables the workload *and* the instrumentation. However, disabling the instrumentation is not necessary. Calling start/stop_per_cpu_kthreads() is enough to apply the new osnoise/cpus config. Link: https://lkml.kernel.org/r/ee633e82867c5b88851aa6040522a799c0034486.1635702894.git.bristot@kernel.org Cc: Ingo Molnar <mingo@redhat.com> Cc: Tom Zanussi <zanussi@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Clark Williams <williams@redhat.com> Cc: John Kacur <jkacur@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Daniel Bristot de Oliveira <bristot@kernel.org> Cc: linux-rt-users@vger.kernel.org Cc: linux-trace-devel@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_osnoise.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 5279a4990493..cacc11b7d5ae 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1678,9 +1678,6 @@ out_unlock:
return count;
}
-static int osnoise_workload_start(void);
-static void osnoise_workload_stop(void);
-
/*
* osnoise_cpus_write - Write function for "cpus" entry
* @filp: The active open file structure
@@ -1725,7 +1722,7 @@ osnoise_cpus_write(struct file *filp, const char __user *ubuf, size_t count,
mutex_lock(&trace_types_lock);
running = osnoise_busy;
if (running)
- osnoise_workload_stop();
+ stop_per_cpu_kthreads();
mutex_lock(&interface_lock);
/*
@@ -1739,7 +1736,7 @@ osnoise_cpus_write(struct file *filp, const char __user *ubuf, size_t count,
mutex_unlock(&interface_lock);
if (running)
- osnoise_workload_start();
+ start_per_cpu_kthreads();
mutex_unlock(&trace_types_lock);
free_cpumask_var(osnoise_cpumask_new);